Abstract: The stripe phenomenon of the tungsten infiltrated copper used in gas rudder (W-7Cu) during the X-ray flaw detection was analyzed by the observation and detection of the X-ray flaw detection negative, metallographic structure, fracture microstructure, and mechanical properties. The results show that, the stripe phenomenon during the X-ray flaw detection is caused by the structure and technological features of the tungsten infiltrated copper materials. The structure in the stripe region is the normal structure of the tungsten infiltrated copper materials without the structural defects of holes, cracks, and uneven infiltrated copper. The product properties in the stripe region meet the technical requirements, and there is no significant difference between the strip region and the non-striped region. The suggestion of grading the X-ray flaw detection for tungsten infiltrated copper used in gas rudder is proposed.